Action by subnational governments to cut carbon emissions has not moved fast enough to take up some of the slack as central governments struggle to deliver what they signed up to in the 2015 Paris Agreement.
Climate campaigners say an undertaking by US President Donald Trump to withdraw from the Paris Agreement — and the large emissions gap between current policies and scientific targets — has underlined the need for coalitions of city and regional governments globally to take matters into their own hands.
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